Growth-rate inhibition of acetoclastic methanogens by ammonia and pH in poultry manure digestion

J.H. Hunik , H.V.M. Hamelers, I.W. Koster
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引用次数: 20

Abstract

The maximum growth rate (μm) of acetoclastic methanogens was measured at ammonia concentrations between 0·55 and 0·74 mol/liter (7·7 and 10·4 g ammonia-N/liter) and a pH between 7·80 and 7·93. The observed μm varied between 0·0046 and 0·0000 h−1 under these experimental conditions. The μm was calculated by monitoring the gas production rate of batch reactors under conditions of substrate saturation (maximum growth rate in prevailing environment); the acetate concentration during all experiments was above 0·025 mol/liter (1·5 g/liter). It was shown that the pH and total ammonia concentration are the predominant inhibition factors for acetoclastic methanogens under these conditions. The best mathematical description for the inhibition of the growth rate is given by an equation which contains the total ammonia concentration as well as the pH, and this description was significantly better than a description using a calculated free ammonia concentration. The results can be used to calculate a minimal hydraulic retention time for acetate degradation in poultry manure digesters.

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氨和pH对禽畜粪便消化中醋酸破酯产甲烷菌生长速率的抑制作用
在氨浓度为0.55 ~ 0.74 mol/l (7.7 ~ 10.4 g氨- n /l)、pH为7.80 ~ 7.93时,测定了产甲烷菌的最大生长速率(μm)。在此实验条件下,观察到的μm在0.0046 ~ 0.00000 h−1之间变化。μm通过监测底物饱和条件下间歇反应器的产气速率(主流环境下最大生长速率)来计算;所有实验中乙酸浓度均在0.025 mol/l (1.5 g/l)以上。结果表明,在此条件下,pH和总氨浓度是抑菌的主要因素。用一个包含总氨浓度和pH值的方程来描述对生长速率的抑制是最好的,这种描述明显优于使用计算的游离氨浓度的描述。该结果可用于计算禽粪消化池中醋酸酯降解的最小水力停留时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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